Poretskaya, E. S. 1974. [Echinoidea]. Pp. 360-368 in V. T. Akopjana (ed.) [Atlas of the fossil fauna of the Armyanskog SSR] Akademiya Nauk Armyanskog SSR, Erevan.
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Poretskaya, E. S.
1974
Echinoidea
Atlas of the fossil fauna of the Armyanskog SSR] Akademiya Nauk Armyanskog SSR